<!doctype html>
<html lang="en">
<head>
    <!-- 引入Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-GLhlTQ8iRABdZLl6O3oVMWSktQOp6b7In1Zl3/Jr59b6EGGoI1aFkw7cmDA6j6gD" crossorigin="anonymous">
    <title>{title}</title>
</head>
<body>
    
    <div class="container mt-5">
        <h1 class="display-4 mb-4">{heading}</h1>